tty: introduce no_tty and use it in selinux

[safe/jmp/linux-2.6] / drivers / char / tty_io.c

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 39db186..5d405a1 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -154,6 +154,7 @@ int tty_ioctl(struct inode * inode, struct file * file,
 static int tty_fasync(int fd, struct file * filp, int on);
 static void release_tty(struct tty_struct *tty, int idx);
 static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
+static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
 
 /**
  *     alloc_tty_struct        -       allocate a tty object
@@ -1558,6 +1559,18 @@ void disassociate_ctty(int on_exit)
        unlock_kernel();
 }
 
+/**
+ *
+ *     no_tty  - Ensure the current process does not have a controlling tty
+ */
+void no_tty(void)
+{
+       struct task_struct *tsk = current;
+       if (tsk->signal->leader)
+               disassociate_ctty(0);
+       proc_clear_tty(tsk);
+}
+
 
 /**
  *     stop_tty        -       propogate flow control
@@ -3280,9 +3293,7 @@ int tty_ioctl(struct inode * inode, struct file * file,
                case TIOCNOTTY:
                        if (current->signal->tty != tty)
                                return -ENOTTY;
-                       if (current->signal->leader)
-                               disassociate_ctty(0);
-                       proc_clear_tty(current);
+                       no_tty();
                        return 0;
                case TIOCSCTTY:
                        return tiocsctty(tty, arg);
@@ -3844,7 +3855,7 @@ static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty)
        tsk->signal->tty_old_pgrp = NULL;
 }
 
-void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty)
+static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty)
 {
        spin_lock_irq(&tsk->sighand->siglock);
        __proc_set_tty(tsk, tty);